US2004013833A1PendingUtilityA1

Compatibilized polyester/polyamide blends

43
Priority: Mar 21, 2002Filed: Mar 21, 2003Published: Jan 22, 2004
Est. expiryMar 21, 2022(expired)· nominal 20-yr term from priority
Inventors:Robert LeeGerald A. HutchinsonSaid FarhaSriram Tharmapuram
B29C 49/22B29C 2949/24B29C 2949/26B29C 2949/3008B29C 2949/3016B29C 2949/3012B29C 2949/22B29C 2949/0872B29C 2949/3024B29C 2949/302B29C 2949/0862B29C 2949/28B29C 2949/3026B29C 2949/3034B29C 2949/3032C08L 77/06C08L 67/02B32B 27/36B65D 1/0207C08L 77/00Y10T428/1352B32B 27/18B65D 1/0215C08L 63/00B32B 27/34B32B 2367/00C08L 77/02B29C 51/00B32B 27/08C08L 23/02
43
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Claims

Abstract

Disclosed are compatibilized polymer blends comprising polyester, polyamide and a compatibilizer. Such compatibilized polymer blends, in preferred embodiments, are fabricated into monolayer or multilayer preforms and/or containers. Containers comprising such blends exhibit good gas barrier properties against gases such as oxygen and carbon dioxide, have a good appearance and may be used as containers for a wide variety of consumer products, including beverages, edibles and cosmetics. In multilayer containers comprising one or more layers of the compatibilized polymer blend and one or more layers of PET or PET-containing copolymers, the present containers have greatly improved impact delamination resistance as compared to those formed using uncompatibilized blends.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A preform or container, comprising 
 a body and a neck finish,    wherein at least said body comprises at least a first layer comprising a compatibilized polymer blend, said compatibilized polymer blend comprising polyamide, PET or a PET-containing copolymer, and at least one compatibilizer selected from IPA-modified PET and PET ionomers.    
     
     
         2 . The preform or container of  claim 1 , wherein the container or preform comprising compatibilized polymer blend exhibits lower haze than a container or preform made from a non-compatibilized blend of polyamide and polyester.  
     
     
         3 . The preform or container of  claim 1 , wherein said preform is a monolayer preform and the neck finish comprises said compatibilized polymer blend.  
     
     
         4 . The preform or container of  claim 1  wherein said IPA modified PET comprises from about 1 mole % to 6 mole % IPA.  
     
     
         5 . The preform or container of  claim 1 , wherein said compatibilizer is a PET ionomer comprising sulfonated PET.  
     
     
         6 . The preform or container of  claim 1 , wherein the PET or a PET-containing copolymer comprises recycled or post-consumer resin.  
     
     
         7 . The preform or container of  claim 1  wherein said at least one layer further comprises at least one antioxidant.  
     
     
         8 . The preform or container of  claim 1 , wherein the PET or a PET-containing copolymer comprises recycled or post-consumer resin.  
     
     
         9 . The preform or container of  claim 1 , further comprising a second layer directly adhered to the first layer, said second layer comprising PET or a PET-containing copolymer.  
     
     
         10 . The preform or container of  claim 9 , wherein the PET or a PET-containing copolymer of the first and/or second layers comprises recycled or post-consumer resin.  
     
     
         11 . The preform or container of  claim 1 , wherein the polyamide constitutes less than or equal to about 15 mol % of the blend.  
     
     
         12 . A preform or container, comprising: 
 a body portion and a neck finish, wherein at least said body portion comprises at least a first and second layers, wherein 
 said first layer comprises a polyester; and  
 said second layer comprises a compatibilized polymer blend, said compatibilized polymer blend comprising: 
 polyamide;  
 PET or a PET-containing copolymer; and  
 at least one compatibilizer selected from IPA-modified PET and PET ionomers.  
 
   
     
     
         13 . The preform or container of  claim 12 , wherein the container or preform comprising compatibilized polymer blend exhibits lower haze than a container or preform made from a non-compatibilized blend of polyamide and polyester.  
     
     
         14 . The preform or container of  claim 12 , wherein said PET or a PET-containing copolymer comprises recycled or post-consumer materials.  
     
     
         15 . The preform or container of  claim 12  wherein said IPA modified PET comprises from about 1 mole % to 6 mole % IPA.  
     
     
         16 . The preform or container of  claim 12 , wherein said compatibilizer is a PET ionomer comprising sulfonated PET.  
     
     
         17 . The preform or container of  claim 12  wherein said compatibilized polymer blend further comprises at least one antioxidant.  
     
     
         18 . The preform or container of  claim 12  wherein said compatibilized blend is substantially polyamide in content by mole %.  
     
     
         19 . The preform or container of  claim 18  further comprising a third layer comprising PET or PET-containing copolymer wherein the second layer comprising said compatibilized polymer blend lies between said third layer and said first layer.  
     
     
         20 . The preform or container of  claim 12  wherein said compatibilized blend is substantially PET or PET-containing copolymer in content by mole %.  
     
     
         21 . The preform or container of  claim 20  wherein said compatibilized polymer blend comprises equal to or less than 15 mole % of the polyamide.  
     
     
         22 . The preform or container of  claim 20  wherein said compatibilized polymer blend is made by a process in which a concentrate of the blend is diluted with PET or PET-containing copolymer.  
     
     
         23 . The preform or container of  claim 12 , wherein the preform or container has an interior surface and an exterior surface and the first layer forms the interior surface.  
     
     
         24 . The preform or container of  claim 12  wherein said compatibilized polymer blend is made by a process in which a concentrate of the blend is diluted with PET or PET-containing copolymer.  
     
     
         25 . A compatibilized polymer blend, comprising: 
 a compatibilized blend comprising polyamide, PET or a PET-containing copolymer, and at least one compatibilizer,    wherein the blend is formed by a process comprising: 
 blending the polyamide, PET or PET-containing copolymer, and compatibilizer in the melt phase;  
 extruding the blend into pellets; and  
 heating said pellets in an inert atmosphere to a temperature between the blend's glass transition temperature and melt temperature thereby causing solid state polymerization and/or reactive compatibilization to occur.  
   
     
     
         26 . The compatibilized polymer blend of  claim 25 , wherein said compatibilizer is selected from IPA-modified PET and PET ionomers.  
     
     
         27 . The compatibilized polymer blend of  claim 25 , wherein said IPA modified PET comprises from about 1 mole % to 6 mole % IPA.  
     
     
         28 . The compatibilized polymer blend of  claim 25 , wherein said compatibilizer is selected from IPA modified PET, p-toluene sulfonic acid (pTSA) modified PET, pyrometillic dianhydride (PMDA) modified PET, and maleic anhydride modified PET.  
     
     
         29 . The compatibilized polymer blend of  claim 25 , wherein said compatibilizer is an acrylic-modified polyolefin ionomer or a bisphenol-A epoxy resin.  
     
     
         30 . The compatibilized polymer blend of  claim 25 , wherein said compatibilizer comprises a PET ionomer comprising sulfonated PET.  
     
     
         31 . The compatibilized polymer blend of  claim 25 , wherein said blend further comprises at least one antioxidant.  
     
     
         32 . A container or preform comprising a first layer comprising the compatibilized polymer blend of  claim 25 .  
     
     
         33 . The container or preform of  claim 32 , wherein the first layer comprises no more than about 15 mole % polyamide.  
     
     
         34 . The container or preform of  claim 33 , wherein the compatibilizer comprises IPA-modified PET and PET ionomers.  
     
     
         35 . The container or preform of  claim 33 , wherein the container or preform comprising compatibilized polymer blend exhibits lower haze than a container or preform made from a non-compatibilized blend of polyamide and polyester.  
     
     
         36 . The container or preform of  claim 32 , further comprising a second layer comprising polyester directly adhered to said first layer.  
     
     
         37 . The container or preform of  claim 36 , wherein said polyester comprises PET or PET-containing copolymer.  
     
     
         38 . The container or preform of  claim 36 , further comprising a third layer comprising polyester wherein said first layer is sandwiched between said second and third layers and said first layer is substantially polyamide in content by mole %.  
     
     
         39 . The container or preform of  claim 38 , wherein the polyester of the second and/or third layer comprises PET or PET-containing copolymer.  
     
     
         40 . A compatibilized polymer blend, comprising 
 polyamide;    PET or a PET-containing copolymer; and    at least one compatibilizer selected from IPA-modified PET and PET ionomer;    wherein the polyamide constitutes less than or equal to about 15 mol % of the blend.    
     
     
         41 . The compatibilized polymer blend of  claim 40 , wherein said compatibilizer is IPA-modified PET which comprises from about 1 mole % to 6 mole % IPA.  
     
     
         42 . The compatibilized polymer blend of  claim 40 , wherein said compatibilizer is a PET ionomer comprising sulfonated PET.  
     
     
         43 . The compatibilized polymer blend of  claim 40 , wherein said blend further comprises at least one antioxidant.  
     
     
         44 . The compatibilized polymer blend of  claim 40 , wherein the blend forms at least a portion of the body of a container or preform.  
     
     
         45 . The preform or container of  claim 44 , wherein the container or preform comprising compatibilized polymer blend exhibits lower haze than a container or preform made from a non-compatibilized blend of polyamide and polyester.

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